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Showing 1 to 14 of 14 for “"hard rock mining"”.
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Experimental analysis of the post-failure behavior of coal and rock under laboratory compression tests
… is the Uniaxial Compressive Strength of the rock, which is commonly adopted as the standard strength indicator. However, in-situ behavior by past researchers have shown that rock and coal show significant residual strength contrary to the failure path observed in a conventional compression …
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Integrated mining, pre-concentration and waste disposal systems for the increased sustainability of hard rock metal mining
… and waste disposal functions into the hard rock metal mining system, prior to treatment by conventional grinding and flotation, is proposed as a novel interpretation of Mine-Mill Integration for improving the economics and environmental impact of exploiting deep, low-grade or otherwise …
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Capital Mediators: American Mining Engineers in the U.S. Southwest and Mexico, 1850-1914
… the technical work and social milieu of American mining engineers to understand the daily negotiations by which private U.S. capital reached up to and across the southwestern border as part of an ongoing project of American territorial and economic expansion. During the late nineteenth and early …
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Investigations on detonation shock dynamics
… from obvious military uses to explosive welding, hard rock mining, and materials processing. Detonations can occur in a variety of materials, including gases (such as premixed hydrogen and oxygen), liquids, and solid explosives. Of particular interest in detonation problems is the motion of the …
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LHD vibrations analysis and numerical modeling during operations
… are extensively used as primary loaders in mining operations. LHDs have proven to be vigorous, extremely productive and reliable in mining applications. They have a wide range of tramming capacities that have enabled them to become an essential component in the hard rock mining …
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Mining for the Future: Dynamics of Artisanal Gold Mining Practice and Governance in the Balan-Bakama (Mande, Mali)
… the social organization of artisanal gold mining in the Balan-Bakama, a zone of the Mande area of southern Mali (West-Africa). Based on fieldwork conducted primarily in 2010-11 I show how villagers and specifically their male and female mining authorities govern mining sites in the …
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Investigating blast fume propagation, concentration and clearance in underground mines using computational fluid dynamics (CFD)
… is an essential component of underground hard rock mining operations. Blasting operations result in the release of noxious gases, presenting both safety and productivity threats. Overestimation of post-blast re-entry time results in production losses, while underestimation leads to …
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Effects of heavy metals on the physical activity and survival of freshwater clams
<p>"Hard rock mining for valuable minerals can have negative impacts on the environment, both through the deposition of mine waste and through direct, physical impacts. The Bunker Hill Mine and other mines in/around Kellogg, ID produced approximately one-fifth of the nation's lead and zinc and …
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The Effects of Backfilling on Ground Control and Recovery in Thin-Seam Coal Mining
… and economically. Past experience with highwall mining of thin-seam coal has indicated that recovery rates tend to be lower than in conventional operations. It is suspected that this will also apply to underground thin-seam mining, regardless of proposed technology or mining method. A method of …
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Investigation of the Pre to Post Peak Strength State and Behaviour of Confined Rock Masses Using Mine Induced Microseismicity
As hard rock mining progresses into higher stress mining conditions through either late stage extraction or mining at depth, the rock mass is driven not just to the peak strength, but often well into the post-peak until complete ‘failure’ occurs and easier mining conditions become evident. Limited …
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The tax treatment of interest incurred by mining companies to finance mining capital expenditure
… tax treatment of interest incurred in financing mining capital expenditure. The capital expenditure under consideration is shaft-sinking and mining equipment. The reason for concern as regards this form of capital expenditure lies in the provisions of section 36(11)(a) of the Income Tax Act 58 of …
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Economic consequences of hole deviations in mining operations
In hard rock mining, drilling and blasting still remain the main method of fragmenting rock. In mining methods involving the use of long holes, extra costs are incurred as a result of consequences associated with hole deviations.The consequences include build-ups, hang-ups and poor rock …
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Economic consequences of hole deviations in mining operations
In hard rock mining, drilling and blasting still remain the main method of fragmenting rock. In mining methods involving the use of long holes, extra costs are incurred as a result of consequences associated with hole deviations.The consequences include build-ups, hang-ups and poor rock …
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Seismic Wave Velocity Variations in Deep Hard Rock Underground Mines by Passive Seismic Tomography
Mining engineers are tasked with ensuring that underground mining operations be both safe and efficiently productive. Induced stress in deep mines has a significant role in the stability of the underground mines and hence the safety of the mining workplace because the behavior of the rock mass …